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OAK HARBOR, Ohio -- A northwestern Ohio nuclear power plant is operating again after undergoing a $600 million upgrade.

FirstEnergy Corp spent the last three months replacing the two original steam generators at the Davis-Besse nuclear plant near Toledo

The company says the nuclear plant should be back to full power within a few days.

The generators installed at Davis-Besse are 74 feet long and weigh 470 tons. They act as heat exchangers and produce super-hot steam used to spin the plant's turbine generator to produce electricity.

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